The DLL released by 3Dfx is only available for Windows. It supports a Quake-specific a subset of OpenGL only (see http://www.cs.unc.edu/~martin/3dfx.html for an inofficial list of supported code paths). No, this DLL is not ported to Linux. No, there is no Glide based Quake version, not even for Windows. I have no information about a Linux glQuake.